trim off prefixing br- of network id's
more pep8 fixes
Fixed network_id trucations and create multiple json files

- removed br- prefix on network_ids via helper function
- separated json file into multiple json files by melange table names due
to dfw migration output being 81MB in one json file
- fix issue of mac ranges and macs not being validate
- added filter to ip_blocks on validation of policies to make sure the ip
blocks have policy_ids
code complete, all tests passing on all databases.
Merge pull request #24 from mpath/trim_network_id_pep8_and_test_all_dbs

Trim network id pep8 and test all dbs